NOTE: As their name suggests hints are not exactly Rotastic cheats, and are usually just simple (but very useful) tips on how you can unlock secret level, features, find hidden areas and such. Hopefully these will make playing Rotastic even more entertaining.

Butcher (Bronze): Kill 10 enemies in a row without losing a life in a multiplayer game
Champion's debut (Bronze): Complete five levels
Diamond necklace (Bronze): Get 5 diamond helmets
Greedy Worker (Silver): Collect 5,000 jewels
Mini copper (Silver): Get all bronze helmets
Ninja (Bronze): Kill 3 enemies in 4 seconds in a multiplayer game
Simply Rotastic (Bronze): Do the Rotastic trick
Socializer (Bronze): Play 20 multiplayer games
The champion is at his pinnacle (Silver): Unlock access to World 7
The champion is confirmed (Silver): Unlock access to World 5
The champion is revealed (Bronze): Unlock access to World 3
This is No life!!! (Gold): Get all gold helmets